Tone modulator for phonographs



Aug. 14,` 19233.

W J @AMER ET AL TONE MoDULAfroR Fon PHoNoGRAPHs Filed Mann 24 Vso Patented, Aug. 14, 1923,

narran srarss reir WILLIAM J'. BAUER, OF NEW YORK, AND FREE/ERICH 0.A EVIEETH AND ABRAHAM S.

LIEADOFF, OF BROOKLYN, NEW YORK, ASSGNORS '.-O QUEEN' LUTOllLf-BEC PHON()- "GB'APH C0., INC., OF'NEW YORK, N. Y., .f3 CORPORATION GF NETQV TONE IVIODULATOR FOR PHONQGRPT-S.

y Application near/mnh 24, 192.1.. sei-iai no. 454,981.

To @ZZ whom z5 may concern: Y

Be it known that weLl/VILLIAM J. BAUER, FREDERICK 0. Wrnnrn, and ABRAHAM S. Mmmm?, citizens of the UnitedStates, and 'residents of New York and Brooklyn,'re spectively, in the counties oi New York and Kings and State of New York, have invented certain new and useful .mprovements in rfone Modulators for Phonographsbf which the following v is al speciiication. i Thisinvention relates toimprovements in tone-modulator for graphophones, and more particularly to that type of modulator having movable elements for "exerting various degrees lot pressure onV the vibratory transmitter bar of the sound box to control the amplitude of the vibrations7 and the general object of the invention is to simplify the construction of the Ymodulator and compactly arrange the'units to admit of the modulator being easily applied to the sound box and the operative partsthereof conven iently and elfectively operated.V To this endV the invention resides in the provision of Vnovel :form of jaws for engaging the transmitter rod anda plate forA supporting the jawsI and novel and effectivev operating mechanism, carried by the plate .for increasing or decreasing the pressure of the jaws on the transmitter rod.

Other objects will appear and be better understood from that embodiment of thel invention of which the following is a speciiication, reference being had to the accompanying drawings forming a part thereof, in which:

Figure l is a side elevation of a sound box with the modulator attaclied'thereto.

Figure 2 is a vertical sectional View taken through the sound box and a portion of the modulator.

Figure 3 is a vertical sectional view taken through the modulator and showing the latter in applied position.

Figure 4 is a rear elevation of the modulator detached from the' sound boX, and,

Figure 5 is a detail perspective View of one of the angular shaped links of the modulator and its companion transmitter bar engaging ger.

ln the drawings the numeral 5 designates a sound box of ordinary construction having the usual diaphragm 6 and the vibratory transmitter bar 7 connected to the did phragm. Y

The modulator is designated in its entirety y the numeral S and comprises a supporting plate 9 which is of dish shape. as shown in Figure'Q, and is mounted on the sound boX 5, the peripheral flange oi the plate serving to hold .the body oii the plate spaced from the sound bor; 5 and is secured to the sound box by means or' screws l0. Openings 1l are formed in the plate so as to prevent the latter `trom dampening the tone. The plate is cut away at the lower edge thereot. as shown in Figures l and 2 to permit of the passageiot' the needle holder carried by the lower end ol the transmitterbar 7. Y

fl. pair of l.. shaped or angular links l2, arepositioned within the plate 9 and have their short arms extending in opposite directions and terminally pivoted to the inner face of theperipheral flange of the plate. li rotatable disc 13 is positioned interiorly oit the plate and is carried by one end of a' shaft la, that extends .through the plate and is journaled therein, the outer end of the shalt having associated ltherewith a manipulating wheel l5. Wlhen theI wheel, ljis'turned mol tion will be imparted to the shaft la and the disc 13.

rlChe disc l3- is provided with a pair of arcuate shaped cam slots 16, which are eccentric of each other and of the axis oi the disc. The upper ends of the long` arms oit the links l2 are terminally provided with laterally ein tending pins 17, which are slide-bly received by the slots 16 in the disc 13. illhen the disc is rotated in one direction7 namely. in a clockwise direction, the pins 17 will lbe directed toward the inner ends of 'the slots 16 e'liect movement of the long arms of the links l2 toward each other and contra-clockwise rotation of the disc will cause the long arms of the links to move away from each other.

A pair of downwardly converging lingers 18,- Jformed preferably of spring metal, are positioned between the long arms of the links l2 and have their lower ends Jfree and their upper ends terminally secured to the long arms of the respective links l2. The free ends of the fingers are adapted to engage the vibratory transmitter bar 7 and their degree of pressure on the rod is regulated by the degree of inward movement given the long arms of the `links 12. The inne-r faces of the lingers are covered with vfibrous or rubber strips 19 toi prevent injury to the bar 7.

When it is desired to' modulateV the sound vibrations the Wheel is rotated in aclock- Wise direction thereby similarly rotating the disc 13, Witha resultant pressure of the `lin gers 18, on the bar 7, the rotation of the Wheel being continued until the desired pressure is exerted on the bar, the tone softening as the pressure, of the ngers increases. e

From the foregoing it Willv have been observed that the construction of modulator described is of simple and compact construcy tion, that itvvill effectively modulate the tone and" that it can'be conveniently Vapplied to any sound box Without reconstructing the latter.v Y

Having thus described the invention,vvhat is cl'aimedas new is" L ina tone modulator for graphophones, a transmitter bar, a pair of resilient lingers adapted to engage the transmitter bar and `means. for controlling the engagement of said' ngers and bar tovary the pressure ot said ngers on said'bar and. to vary the extent of contact b etiveenjsaid' iingers and bar, soV that said ContactA may vary from substanf tiall'y a single point tosubstantially the en tire length ofthe transmitter bar.

l 2. In a tone modulator yfor graphophones,

a transmitter bar, means engaging the transmittel' bar and second means adaptedto Avary 1 the, pressure ofsaidfirst inentionedrnea-ns on said bar andi adapted further to vary the er;u tentv of'contact between saidv first mentioned means andi said bar, inusueh Ina-nner'that said contact may vary from Vsubstantially a single point to substantially the entire length of the transmitter bar.

3. A sound modulator for graphcphones comprising a support adapted to be attached to the sound box, a rotatable element carried by saidsupport, movable elements' having one end vthereof secured to. tli'e support and having their otherV endA movably connected with the rotatable element, and transmitter bar engaginge-lement-s .carried by said movable elements.V

et. A sound modulator for graphophones including a support, a pair of transmitting bar engaging elements movably mounted on thesupport, a rotatable element carried by the support, and having cam slots therein and mea-ns carried by the movable elements and engaging in lthe slots and adapted to Y effect movement of tbe movable elements Whenthe rotatable element is operated.

v 5.. A sound modulator including a support, apairoangular sha-pedelements eachhav`- ing one end secured tothe support, tra-nsi mitter bar engaging fingers ,carriedY by the angular shaped elements and means carried by the. support for effecting movement oi theV angular shapedV elements.

6.' A sound modulator including a sup portA` movable elements carried by the support,` and' each having one end secured to said support, operating means Jfor the movable elements and' carried by the support, and, transmitter bar Vengaging fingers carried by the movable elements.

Signedat New' Yorln in the county ofNeW York and State off New York, this 5th dja-y oi March 15.21921. 

